If you cannot fill in any metadata fields despite having created them, you have forgotten to add them to a set or not added the set to the page. In that case, if you click the metadata icon on the top right, you will see the following:

Precondition: You need to be a space administrator.

Solution: Check, if you have added at least one metadata set to your page and at least one metadata field to the set. Please refer to our alt_Administrator Guide for detailed instructions.